Introduce a simple CMYK toning method.

CMYK is a color for CMYK printers, representing cyan (blue), magenta (magenta), yellow (yellow), black (black, without B black), CMYK color for printing, such as books, Posters, brochures, prints or general vinyl work. It's easy to say that every job that needs to be printed will use the entire CMYK color system.
Using color block mode to adjust color is an efficient and accurate way to work.
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